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Investment in Unconsolidated Real Estate Ventures - Summary of Results of Operations of Real Estate Ventures with Interests (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Equity in income (loss) of Real Estate Ventures | $ (358) | $ 1,084 | $ (1,183) | $ 336
DRA Austin Venture [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Revenue | 13,904 | 26,140 | 28,260 | 47,692
Operating expenses | (5,751) | (9,699) | (11,817) | (19,012)
Interest expense, net | (2,227) | (3,744) | (4,521) | (7,433)
Depreciation and amortization | (5,028) | (9,064) | (10,726) | (18,293)
Net income (loss) | $ 898 | $ 3,633 | $ 1,196 | $ 2,954
Ownership interest % | 50.00% | 50.00% | 50.00% | 50.00%
Company's share of net income (loss) | $ 449 | $ 1,817 | $ 598 | $ 1,477
Basis adjustments and other | 204 | (171) | 135 | (196)
Equity in income (loss) of Real Estate Ventures | 653 | 1,646 | 733 | 1,281
Brandywine - AI Venture LLC [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Revenue | 5,970 | 7,988 | 11,806 | 15,313
Operating expenses | (2,877) | (3,248) | (5,421) | (6,188)
Interest expense, net | (869) | (1,301) | (1,733) | (2,446)
Depreciation and amortization | (2,546) | (3,133) | (4,683) | (5,942)
Net income (loss) | $ (322) | $ 306 | $ (31) | $ 737
Ownership interest % | 50.00% | 50.00% | 50.00% | 50.00%
Company's share of net income (loss) | $ (161) | $ 153 | $ (16) | $ 369
Basis adjustments and other | (13) | (11) | 2 | 299
Equity in income (loss) of Real Estate Ventures | $ (174) | 142 | (14) | 668
HSRE-BDN I, LLC (evo at Cira Centre South) [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Revenue |  | 3,101 | 995 | 6,255
Operating expenses |  | (712) | (250) | (1,391)
Interest expense, net |  | (1,014) | (388) | (1,912)
Depreciation and amortization |  | (1,128) | (376) | (2,256)
Loss on early extinguishment of debt |  |  | (718) |
Net income (loss) |  | $ 247 | $ (737) | $ 696
Ownership interest % | 50.00% | 50.00% | 50.00% | 50.00%
Company's share of net income (loss) |  | $ 124 | $ (369) | $ 348
Basis adjustments and other |  | 46 | 11 | 53
Equity in income (loss) of Real Estate Ventures |  | 170 | (358) | 401
Other Income [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Revenue | $ 21,227 | 21,590 | 42,861 | 43,838
Operating expenses | (11,461) | (11,513) | (23,369) | (23,747)
Interest expense, net | (4,856) | (5,213) | (9,436) | (10,310)
Depreciation and amortization | (6,218) | (7,046) | (12,391) | (14,642)
Net income (loss) | (1,308) | (2,182) | (2,335) | (4,861)
Company's share of net income (loss) | (764) | (645) | (1,396) | (1,907)
Basis adjustments and other | (73) | (229) | (148) | (107)
Equity in income (loss) of Real Estate Ventures | (837) | (874) | (1,544) | (2,014)
Unconsolidated Real Estate Ventures [Member] |  |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |  |
Revenue | 41,101 | 58,819 | 83,922 | 113,098
Operating expenses | (20,089) | (25,172) | (40,857) | (50,338)
Interest expense, net | (7,952) | (11,272) | (16,078) | (22,101)
Depreciation and amortization | (13,792) | (20,371) | (28,176) | (41,133)
Loss on early extinguishment of debt |  |  | (718) |
Net income (loss) | (732) | 2,004 | (1,907) | (474)
Company's share of net income (loss) | (476) | 1,449 | (1,183) | 287
Basis adjustments and other | 118 | (365) |  | 49
Equity in income (loss) of Real Estate Ventures | $ (358) | $ 1,084 | $ (1,183) | $ 336

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